// function practise

#include <iostream>
using namespace std;

void swap01(int &a, int &b)
{
	int temp = a; 
	a = b;
	b = temp;
//	a = ++a;
//	b = ++b;
}

int main()
{
	int one = 1;
	int two = 2;
	swap01(one,two);
	printf("one: %d, two: %d\n", one, two);
	swap01(one,two);
	int c;
	cout<<"c:"<<c<<endl;

	
}
